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Abstract

In a fiber optic read head utilizing aligned pairs of fiber optic elements it is the practice to inspect fabricated assemblies, by measuring the total light transmission of each full and half channel using a specified light source and a photodetection device. Using this method makes diagnosis of the cause of low-light transmission difficult,since it is not possible to identify which head, emitter or receiver is causing a problem.

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United States

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English (United States)

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Photographic Characterization of Fiber Optic Read Heads

In a fiber optic read head utilizing aligned pairs of fiber optic elements it is
the practice to inspect fabricated assemblies, by measuring the total light
transmission of each full and half channel using a specified light source and a
photodetection device. Using this method makes diagnosis of the cause of low-
light transmission difficult,since it is not possible to identify which head, emitter or
receiver is causing a problem.

To both inspect and directly diagnose the head causing a problem, a
photographic film is held in contact with the emitter head exit channels, while
passing light through the optic fibers to expose the film. The same procedure is
used with the receiver head channels to obtain a 1:1 photographic display of
each head assembly. The resulting film negatives and/or positives from each
head can now be compared and measured directly, since each is a direct 1:1
replica of the light transmission patterns from the respective emitting and
receiving channels.

The films can easily be enlarged to simplify visual examination, and an
overlay technique (where the emitter head negative or positive is placed over the
emitter head negative or positive) is used to detect misalignment, assembly
warpage, etc. Also, direct dimensional measurements are easily obtained from
the film (s), whereas such measurements made on the heads themselves are
difficult to perform and correlate and could damage the polishe...